agreed, pehaps some of the non Manchester Caldervale metro trains....not really necessary for a 158, equally Middlesbro - Carlisle not really suited to a pacer.
I agree that the stoppers on the Calder Valley don't suit 158s, nor does the Selby - Bradford - Wakefield "merry go round". The trouble is that (to make up for having no units spare) Northern have scheduled the Manchester - Halifax - Leeds "fast" service, the Manchester - Halifax - Leeds "slow" service, the Wakefield - Bradford - Leeds service and the Blackpool - York service into one massive interworked muddle (so that some services from Bradford terminate in Leeds eastbound, but the west bound service starts from Selby etc), and the allocation is a muddle of Pacers and Sprinters (so that the biggest trains are used on the peak services where the capacity is most needed).
Sorry if this sounds a bit confusing, but it seems a logistical headache due to the need to squeeze resources as hard as possible. Ideally I'd have Pacers on the Wakefield - Huddersfield - Bradford service and 158s on the faster Manchester services (with 155s/156s on the others), but there aren't enough units spare to do that (and ensure that each route keeps its allocation)
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Northern have gained twenty seven additional 158s, and eight additional centre cars (from TPE) that have been fitted into 158752 to 158759 which were North West Trains units back in the day so are part of the long term resident fleet. Except for a couple of 153s that moved to EMT and the seven 142s that went to FGW (Which were counterbalanced by the three 180s), I cant think of anything that moved away from Northern after they gained these units: Im having difficulty getting my head round the notion that FNW/ATN were short of that many units beforehand, I dont recall there being that many cancellations that would suggest such a vast shortage.
Some frequencies have been increased. For example the Barnsley service (each hour) used to be
- Sheffield - Barnsley - Wakefield - Castleford - Leeds (all stops)
- Sheffield - Barnsley - Wakefield (all stops)
- Sheffield - Barnsley - Huddersfield (all stops)
Now we have
- Sheffield - Barnsley - Wakefield - Castleford - Leeds (all stops)
- Sheffield - Barnsley - Wakefield Leeds (semi fast)
- Nottingham - Sheffield - Barnsley - Wakefield Leeds (semi fast)
- Sheffield - Barnsley - Huddersfield (all stops)
Leeds - Mirfield used to be an hourly stopper (to Huddersfield), now its half hourly (one to Huddersfield, one to Brighouse/ Todmorden/ Rochdale/ Manchester).
Diverting the Manchester Airport - Liverpool service away from Warrington meant the Oxford Road Pacer service to Liverpool was doubled (before the change it was one Pacer from Oxford Road to Warrington and one from Warrington to Liverpool IIRC, now it is a half hourly service).
Growing demand means some routes need to be doubled up now that a single unit could run before.
However, at the same time the Oldham trams freed up some Pacers. All swings and roundabouts.
That said, I think the staffing problems which FNW and ATW had sometimes covered up the true lack of stock availability.